net/TUNABLE

   1 The following parameters should be tunable at compile time. Some of them
   2 exist as sysctls too.
   3
   4 This is far from complete
   5
   6 Item                    Description
   7 ----------------------------------------------------------------------------
   8 MAX_LINKS               Maximum number of netlink minor devices. (1-32)
   9 RIF_TABLE_SIZE          Token ring RIF cache size (tunable)
  10 AARP_HASH_SIZE          Size of Appletalk hash table (tunable)
  11 AX25_DEF_T1             AX.25 parameters. These are all tunable via
  12 AX25_DEF_T2             SIOCAX25SETPARMS
  13 AX25_DEF_T3             T1-T3,N2 have the meanings in the specification
  14 AX25_DEF_N2
  15 AX25_DEF_AXDEFMODE      8 = normal 128 is PE1CHL extended
  16 AX25_DEF_IPDEFMODE      'D' - datagram  'V' - virtual connection
  17 AX25_DEF_BACKOFF        'E'xponential 'L'inear
  18 AX25_DEF_NETROM         Allow netrom 1=Y
  19 AX25_DF_TEXT            Allow PID=Text 1=Y
  20 AX25_DEF_WINDOW         Window for normal mode
  21 AX25_DEF_EWINDOW        Window for PE1CHL mode
  22 AX25_DEF_DIGI           1 for inband 2 for cross band 3 for both
  23 AX25_DEF_CONMODE        Allow connected modes 1=Yes
  24 AX25_ROUTE_MAX          AX.25 route cache size - no currently tunable
  25 Unnamed (16)            Number of protocol hash slots (tunable)
  26 DEV_NUMBUFFS            Number of priority levels (not easily tunable)
  27 Unnamed (300)           Maximum packet backlog queue (tunable)
  28 MAX_IOVEC               Maximum number of iovecs in a message (tunable)
  29 MIN_WINDOW              Offered minimum window (tunable)
  30 MAX_WINDOW              Offered maximum window (tunable)
  31 MAX_HEADER              Largest physical header (tunable)
  32 MAX_ADDR_LEN            Largest physical address (tunable)
  33 SOCK_ARRAY_SIZE         IP socket array hash size (tunable)
  34 IP_MAX_MEMBERSHIPS      Largest number of groups per socket (BSD style) (tunable)
  35 16                      Hard coded constant for amount of room allowed for
  36                         cache align and faster forwarding (tunable)
  37 IP_FRAG_TIME            Time we hold a fragment for. (tunable)
  38 PORT_MASQ_BEGIN         First port reserved for masquerade (tunable)
  39 PORT_MASQ_END           Last port used for masquerade   (tunable)
  40 MASQUERADE_EXPIRE_TCP_FIN       Time we keep a masquerade for after a FIN
  41 MASQUERADE_EXPIRE_UDP   Time we keep a UDP masquerade for (tunable)
  42 MAXVIFS                 Maximum mrouted vifs (1-32)
  43 MFC_LINES               Lines in the multicast router cache (tunable)
  44
  45 NetROM parameters are tunable via an ioctl passing a struct
  46
  47 4000                    Size a Unix domain socket malloc falls back to
  48                         (tunable) should be 8K - a bit for 8K machines like
  49                         the ALPHA
  50